/*
 * Copyright 2002-2015 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.lee.util;

/**
 * Utility methods for simple pattern matching, in particular for Spring's typical "xxx*", "*xxx" and "*xxx*" pattern
 * styles.
 *
 * @author Juergen Hoeller
 * @since 2.0
 */
public abstract class PatternMatchUtils {

    /**
     * Match a String against the given pattern, supporting the following simple pattern styles: "xxx*", "*xxx", "*xxx*"
     * and "xxx*yyy" matches (with an arbitrary number of pattern parts), as well as direct equality.
     * 
     * @param pattern the pattern to match against
     * @param str the String to match
     * @return whether the String matches the given pattern
     */
    public static boolean simpleMatch(String pattern, String str) {
        if (pattern == null || str == null) { return false; }
        int firstIndex = pattern.indexOf('*');
        if (firstIndex == -1) { return pattern.equals(str); }
        if (firstIndex == 0) {
            if (pattern.length() == 1) { return true; }
            int nextIndex = pattern.indexOf('*', firstIndex + 1);
            if (nextIndex == -1) { return str.endsWith(pattern.substring(1)); }
            String part = pattern.substring(1, nextIndex);
            if ("".equals(part)) { return simpleMatch(pattern.substring(nextIndex), str); }
            int partIndex = str.indexOf(part);
            while (partIndex != -1) {
                if (simpleMatch(pattern.substring(nextIndex),
                        str.substring(partIndex + part.length()))) { return true; }
                partIndex = str.indexOf(part, partIndex + 1);
            }
            return false;
        }
        return (str.length() >= firstIndex && pattern.substring(0, firstIndex).equals(str.substring(0, firstIndex))
                && simpleMatch(pattern.substring(firstIndex), str.substring(firstIndex)));
    }

    /**
     * Match a String against the given patterns, supporting the following simple pattern styles: "xxx*", "*xxx",
     * "*xxx*" and "xxx*yyy" matches (with an arbitrary number of pattern parts), as well as direct equality.
     * 
     * @param patterns the patterns to match against
     * @param str the String to match
     * @return whether the String matches any of the given patterns
     */
    public static boolean simpleMatch(String[] patterns, String str) {
        if (patterns != null) {
            for (String pattern : patterns) {
                if (simpleMatch(pattern, str)) { return true; }
            }
        }
        return false;
    }

}
